钻井液与完井液2025，Vol.42Issue(6)：764-771,8.DOI:10.12358/j.issn.1001-5620.2025.06.008
准噶尔盆地东部深层煤岩气钻井液防漏技术
Technologies for Lost Circulation Control in Deep Coalbed Methane Drilling in the East of the Junggar Basin
摘要
Abstract
Lost circulation in reservoir drilling has been encountered in deep coalbed methane drilling in the east of Junggar Basin(Xinjiang)because the reservoir formations have insufficient pressure bearing capacity.Based on the characteristics of the lost circulation encountered,the mineral composition of the reservoir formations was analyzed and the morphology of the formations observed using SEM.The mechanisms of lost circulation were determined to be the extension of fractures and the connection of pores in the formations,and a countermeasure for overcoming the lost circulation problem was presented as the synergistic application of"plugging agent+filtration agent+shale inhibitor".Based on the"reduce costs and increase efficiency"principle,the concentrations of the key drilling fluid additives were optimized.The key additives were then formulated through orthogonal experiment with the basic slurry to form four lost circulation prevention drilling fluids.The four drilling fluids were then tested for their performance in permeability recovery and based on the results,a drilling fluid with the best reservoir protection was determined.Experimental results show that this drilling fluid has stable rheology,the percent permeability recovery can be as high as 87.42%,the API and HTHP filtration rates are 4.16 mL and 9.52 mL,respectively,the filtration rate on sand-bed test is less than 15 mL,indicating that the drilling fluid has good plugging capacity.In inhibitive capacity experiments,the rate of swelling of drilled cuttings tested with the filtrate of the drilling fluid is only 0.96%,and the percent cuttings recovery in hot rolling test with the drilling fluid is as high as 91.6%,indicating that the drilling fluid has excellent inhibitive capacity.In field application of the optimized drilling fluid,lost circulation was mitigated,drilling time shortened,complex working conditions minimized,and reservoirs were protected more effectively.The use of the optimized drilling fluid has provided an important technical support and application reference to safe and efficient drilling of deep coalbed methane.关键词
深层煤岩气/裂缝发育/防漏对策/钻井液/渗透率恢复Key words
Deep coalbed methane/Developed fractures/Measures for lost circulation prevention/Drilling fluid/Permeability recovery分类
能源科技引用本文复制引用
刘颖彪,戎克生,杨泽,巩加芹,坎尼扎提,张辉,安锦涛..准噶尔盆地东部深层煤岩气钻井液防漏技术[J].钻井液与完井液,2025,42(6):764-771,8.基金项目
中国石油科技专项项目"深地煤岩气成藏理论与效益开发技术研究"(2023ZZ18) （2023ZZ18）
国家青年科学基金"深层煤岩气水平井井壁失稳机理研究"(52404015). （52404015）
